Announcements about the October 15 publication of the Spanish translation of the novel have started appearing on the internet. The translator's name is not mentioned... at least, we couldn't find it. Also, supposedly the publication was announced by the publisher, Tusquets Editores, but we could not find any information on the publisher's page (http://www.tusquetseditores.com/). It is worth noting that the Spanish title does not include "Tsukuru Tazaki" -- it can be translated as something like: The Years of Pilgrimage of a Colorless Boy.
It is possible to already preorder the book (for 18.95 euros): http://www.librerialuces.com/libro/los-anos-de-peregrinacion-del-chico-sin-color_445405